Glad it worked out for you.
Sorry about the Datsport 4dr pic—I was referring to install pics in general.
All 510 seatbelt mounting holes have a 7/16-20 nut behind them, so you should be set.
Post pics when you are done...

Upper front seat belt mount is actually up in the headliner just rearward of the b pillar. See if this post helps (has photos): http://www.the510realm.com/viewtopic.php?f=1&t=10343&hilit=Slodat+seat+belt&start=30 Many buy a retractable front seatbelt set with rigid female receivers and an 8” or 12” ...

If it's not going to be a show car, an abs dash cap for under $100 for a '68 works fine for a '69 if you don't mind the slight dip in the center. Google 1968 dash cap to see several vendors. Smooth down the ridges in the OEM cracked cap, smear on the adhesive, drop on the abs cap and weigh down over...

Odd that the Subaru LSD oil would be NLA, though I read somewhere hat K0318Y0000 80-90W supercedes the K0305Y0900 straight 90W. Have you dropped by your local Subaru Dealer to ask what they are using now? Spec in STi LSD is 90W. An Amazon search shows Subaru oil is in stock here: http://www.amazon.c...

Many folks like the $100-150 Arcan X35L, as it was low profile and had high lift (23"?). But it weighs 100lbs. http://www.northerntool.com/shop/tools/product_200345429_200345429 It used to be at Costco, but didn't sell well, so the replaced it with an Arcan hybrid alum/steel jack for $100 that weghs...

Very Nice work Matt--on both the pillar vents and the inner vents!
Make sure all four, and esp the upper pairr of mounting holes (as they are next to a rib) on the pillar vents have a chamfer for the screw heads.
Could be a "DOH" moment.